That's for the 80 GB model. Since the Zune is 30 GB, you want to compare to the 30 GB iPod. Therefore, the comparison becomes:

Which means that the Zune has 44.75% more volume than the same-capacity iPod.

yes I know, but the point I was trying to make was that a ipod ( even 80gb ) can fit in your pocket, so surely a Zune would be able to. ( I normally wear pants with large pockets, so I could probably fit ipods in one pocket )